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Product Name: Octadecyltrichlorosilane
Chemical Formula: C18H37Cl3Si
CAS Number: 112-04-9
Synonyms: Trichloro(octadecyl)silane, n-Octadecyltrichlorosilane
Recommended Uses: Surface treatment, silanization agent in electronics, advanced material manufacturing
Manufacturer/Supplier: Advanced chemical suppliers, industrial chemical distributors
Contact Information: Emergency response number, business hours support, supplier emergency hotline
Emergency Telephone: Local poison control, supplier emergency line, regional hazardous material hotline
GHS Classification: Skin Corrosive (Category 1B), Serious Eye Damage (Category 1), Specific Target Organ Toxicity, Single Exposure (Category 3, respiratory system)
Pictogram: Corrosive, Exclamation mark
Signal Word: Danger
Hazard Statements: Causes severe skin burns and eye damage. May cause respiratory irritation. Reacts violently with water, releasing hydrogen chloride gas.
Precautionary Statements: Do not breathe mist, vapors. Use only outdoors or in a well-ventilated area. Wear protective gloves, eye protection, face protection, protective clothing.
Chemical Identity: Octadecyltrichlorosilane
Common Name: OTS
Chemical Formula: C18H37Cl3Si
Molecular Weight: 391.93 g/mol
Concentration: 98-100% (pure substance)
Impurities: Trace levels of related chlorosilanes, manufacturing byproducts
Other Components: No significant additives or stabilizers detected
Inhalation: Remove victim to fresh air immediately. Seek medical assistance if breathing is difficult. Provide oxygen if available.
Skin Contact: Remove contaminated clothing and wash skin with plenty of running water for at least 15 minutes. Seek immediate medical attention for burns or persistent irritation.
Eye Contact: Flush eyes with water or saline for at least 15 minutes, lifting eyelids occasionally. Remove contact lenses if present and easy to do. Seek immediate eye specialist evaluation.
Ingestion: Do not induce vomiting. Rinse mouth thoroughly with water. Never give anything by mouth to an unconscious person. Seek emergency medical care immediately.
Suitable Extinguishing Media: Dry chemical powder, carbon dioxide, alcohol-resistant foam. Use sand or inert material for small fires.
Unsuitable Extinguishing Media: Water may cause violent reaction, generating hydrochloric acid vapors.
Hazardous Combustion Products: Hydrogen chloride, silicon oxides, chlorinated compounds, possible carbon monoxide.
Protective Equipment: Full-face self-contained breathing apparatus, chemical-resistant protective clothing.
Fire Fighting Advice: Approach fire from upwind, keep containers cool using dry methods. Eliminate all ignition sources in immediate area. Toxic and corrosive gases may evolve during combustion; evacuate downwind personnel.
Personal Precautions: Wear appropriate protective equipment, including gloves, goggles, respirator.
Environmental Precautions: Prevent material from entering drains, waterways, soil. Block off spill area to prevent runoff.
Methods for Clean Up: Absorb spillage with dry inert materials like sand or earth. Avoid moisture due to exothermic hydrolysis. Collect residue into suitable sealed chemical waste containers. Ventilate area thoroughly. Decontaminate area using approved neutralization agents for chlorosilanes.
Emergency Procedures: Restrict access, contain spread, notify local emergency responders if large quantities released. Dispose collected waste following hazardous materials regulations.
Handling: Use only in a chemical fume hood or well-ventilated area. Avoid all contact with skin, eyes, and clothing. Prevent exposure to moisture; tightly seal containers after use. Ground and bond containers to avoid static build-up. Open containers slowly and with caution.
Storage: Keep in tightly closed containers, under dry inert gas if possible. Store in a cool (2-8°C), dry, well-ventilated, fire-resistant location away from acids, bases, alcohols, and water. Segregate from incompatible materials. Clearly label storage area with hazard identification.
Exposure Limits: No occupational exposure limits for OTS specifically, but use an exposure guideline based on hydrochloric acid vapor and organic solvent standards. Limit possible vapor and mist formation through engineering controls.
Engineering Controls: Chemical fume hood, local exhaust ventilation, sealed transfer systems.
Personal Protective Equipment: Nitrile or butyl rubber gloves, splash-proof chemical safety goggles, face shield, flame-retardant laboratory coat, full respiratory protection for vapor/mist formation. Emergency eyewash and safety shower in work area.
Hygiene Measures: Wash hands, face thoroughly after handling, before all breaks, and end of work. Remove contaminated clothing immediately. Do not eat, drink or smoke while using octadecyltrichlorosilane.
Appearance: Colorless to pale yellow liquid
Odor: Pungent, acrid, hydrochloric-like
Melting Point: Approximately 24-27°C
Boiling Point: 225°C at 760 mmHg
Vapor Pressure: Low at room temperature
Density: 0.98 g/cm3 at 25°C
Solubility: Reacts and decomposes in water, soluble in organic solvents such as hydrocarbons and chlorinated solvents
Flash Point: 95°C
Auto-Ignition Temperature: Not established
Partition Coefficient (log Kow): High (strong lipophilicity)
Evaporation Rate: Slow under standard conditions
Chemical Stability: Stable in tightly closed containers, protected from moisture and light.
Reactivity: Violent hydrolysis with water, alcohols, and alkaline solutions, producing hydrochloric acid.
Conditions to Avoid: Exposure to moisture, high temperatures, prolonged light.
Incompatible Materials: Water, alcohols, acids, bases, oxidizing agents.
Hazardous Decomposition Products: Hydrogen chloride, organosilicon compounds, silicon dioxide, chlorinated hydrocarbons.
Polymerization: Hazardous polymerization does not occur under normal handling.
Acute Toxicity: No acute human toxicity data; rat oral LD50 estimated >2000 mg/kg. Severe skin, eye, and respiratory corrosion from contact or vapor.
Skin Corrosion/Irritation: Causes severe burns, blistering, possible ulceration. Strong irritant effect even with short-term exposure.
Eye Damage: Causes irreversible damage, blindness, permanent loss of vision.
Inhalation: May cause severe irritation, chemical pneumonitis, cough, sore throat.
Sensitization: No data indicating skin sensitization, but prolonged/repeated exposures increase risk.
Chronic Effects: Prolonged exposures may damage mucous membranes, respiratory system.
Mutagenicity/Carcinogenicity: No available data for mutagenic or carcinogenic effects specific to OTS.
Ecotoxicity: Highly toxic to aquatic life based on hydrolysis products (hydrochloric acid and silanols). Long-term damage possible in waterways.
Persistence and Degradability: Hydrolysis in water is rapid, producing persistent silanols and inorganic acids.
Bioaccumulation Potential: High due to hydrophobic nature and long alkyl chain; may accumulate in aquatic organisms.
Mobility in Soil: Limited due to rapid binding to soil particles, but hydrolysis product may leach.
Other Adverse Effects: High hazard to local flora and fauna if chronic exposure occurs via spills or improper disposal.
Disposal Methods: Dispose strictly as hazardous waste through approved incineration or high-temperature destruction by licensed contractor.
Contaminated Packaging: Treat packaging as hazardous; triple rinse with inert solvent before disposal or incinerate.
Special Precautions: Do not release into drains or surface water; must not enter regular solid waste streams. Label containers for hazardous chemical content.
UN Number: UN 2987
Proper Shipping Name: Trichlorosilane, n.o.s. (Octadecyltrichlorosilane)
Transport Hazard Class: 8 (Corrosive)
Packing Group: II
Labels: Corrosive
Marine Pollutant: Yes
Special Transport Precautions: Use corrosion-resistant containers, keep dry, seal tightly, store away from food and feed, provide emergency information to carrier.
Regulatory Status: Listed under significant chemical inventories (TSCA United States, DSL Canada, EINECS Europe)
Hazard Classification: OSHA Hazardous Chemical, EU Classification: Corrosive (C), Dangerous for the Environment (N)
Right-to-Know: Listed in state and federal chemical reporting (SARA 313, California Proposition 65 as applicable)
WHMIS (Canada): Class E (Corrosive Material)
Other Regulations: Complies with REACH requirements, subject to workplace safety standards (OSHA, ACGIH, EU occupational exposure limits). Product safety sheet must be supplied to all professional users.
